Step 1

Preheat oven to 200°C. Place 1 potato, cut-side down, on a board and make thin, evenly spaced cuts at 5mm intervals, about two-thirds of the way through. Place in a bowl. Repeat with remaining potatoes. Add oil, garlic and rosemary to potatoes. Season with salt and pepper and toss to combine.

Step 2

Place in a roasting pan. Bake in oven, turning occasionally, for 1 hour or until golden brown and crisp. Transfer to a serving bowl to serve.